General source code refactoring

scripts/compose.cjs

@@ -0,0 +1,29 @@
+const fs = require("node:fs");
+const path = require("node:path");
+const vm = require("node:vm");
+const sources = require("./sources.cjs");
+
+const root = path.resolve(__dirname, "..");
+
+/** Compose classic scripts at build time; never load or evaluate code at runtime. */
+function composeScript(target, { bootstrap = true } = {}) {
+  const files = sources[target];
+  if (!files) throw new Error(`Unknown script target: ${target}`);
+  if (new Set(files).size !== files.length) throw new Error(`Duplicate source in ${target}`);
+  const parts = files.map(file => {
+    const source = fs.readFileSync(path.join(root, file), "utf8");
+    new vm.Script(source, { filename: file });
+    return `// Source: ${file}\n${source}`;
+  });
+  if (target === "content") {
+    const css = fs.readFileSync(path.join(root, "src/content/styles/redwood.css"), "utf8");
+    parts.unshift(`const redwoodStyles = ${JSON.stringify(css)};`);
+  }
+  const factory = target === "content" ? "createContentApplication" : "createBackgroundApplication";
+  const ending = bootstrap ? `${factory}().start();` : `return ${factory};`;
+  const output = `(function () {\n  "use strict";\n${parts.join("\n")}\n${ending}\n})();\n`;
+  new vm.Script(output, { filename: `${target}.js` });
+  return output;
+}
+
+module.exports = { composeScript, sources };